• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.20 no.4
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• pp.123-130
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• 2006

Airport facility is infrastructure that become external credit worthiness and linear measure of country competitive power. Among them, an airport electric power receiving and distribution facility is very important. In this paper, sorted domestic airline as 4 grades by code to accomplish standardization for airport electric power receiving and distribution facility. And established define and coverage about electric power receiving and distribution facility. And then analyze problem of existing airport and presents standardization. Finally, present standard single-line diagram by airport grade and system grade standard of airport electric power receiving and distribution facility

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37C no.9
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• pp.784-790
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• 2012

In this paper, we propose a upstream transmission method to extend coverage in visible light communication (VLC) systems. We extend transmission distance by using focused infrared(IR) light emitting diodes(LEDs). Since the focused light covers just limited area, it might have a difficulty in transmitting data if the transmitter and receiver are not properly aligned. To solve this problem, we arrange multiple IR-LEDs in different direction and select a single best performing IR-LED among multiple IR-LEDs. Also, the transmission performance is periodically checked and another IR-LED is reselected to support the required quality of service (QoS) and to minimize battery consumption required by a mobile terminal.

• Survey Research
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• v.9 no.3
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• pp.55-69
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• 2008

In most telephone surveys in Korea, telephone numbers are selected from the directories. Inevitably, such samples may lack representativeness due to poor coverage rate. To resolve the problem, Kang et al.(2008) implemented RDD(random digit dialing) method for nationwide sampling in Korea. The aim of this study is to compare an RDD sample with a traditional telephone quota sample that were collected independently by two survey institutes commissioned by the KBS-MBC consortium for the 2007 Presidential Election of Korea.

• The Korean Journal of Air & Space Law and Policy
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• v.6
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• pp.137-147
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• 1994

Clearly there are many legal arguments and criticisms surrounding the proposals for change in the Warsaw Convention and the need for a radical review. The question remains is unlimited liability the answer or should there be some other form of supplemental compensation and if so, what limits should be applicable. It does seem that the adopted limits of the Convention are seen by many as the first line of defence, which, dependent on political and cultural differences, the legal interpretation of contractual wording and the legal system globally have resulted in enormous differences in compensation paid whether or not the Convention limits were imposed. An example of this is in the United States, which highlights the significance of the problem in that domestic travellers without Convention Limits can, through the American legal system, obtain compensation in the multi-million dollar area for a death claim, whereas a passenger t1ying internationally would in the first instance be subject to Convention Limits. expensive legal action through litigation. To date, we can advise that insurers have not charged additional premium for unlimited liability coverage. Insurance rates as we have stated are hardening considerably. To date, average rate increases have been plus 56% for aircraft hull and plus 45% for liabilities. Insurers last year suffered global losses of around US $ 1.1 Billion against a premium income of US $ 800,000. The target premium income for 1993 is believed to be in the region of US $1.4 Billion.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.7 no.11
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• pp.2561-2576
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• 2013

The ship ad-hoc network (SANET) extends the coverage of the high data-rate terrestrial communications to the ships with the reduced cost in maritime communications. Cognitive radio (CR) has the ability of sensing the radio environment and dynamically reconfiguring the operating parameters, which can make SANET utilize the spectrum efficiently. However, due to the dynamic topology nature and no central entity for data fusion in SANET, the interference brought into the primary network caused by the hidden primary user requires to be carefully managed by a sort of decentralized cooperative spectrum sensing schemes. In this paper, we propose a self-weighted decentralized cooperative spectrum sensing (SWDCSS) scheme to solve such a problem. The analytical and simulation results show that the proposed SWDCSS scheme is reliable to detect the primary user in SANET. As a result, secondary network can efficiently utilize the spectrum band of primary network with little interference to primary network. Referring the complementary receiver operating characteristic (ROC) curves, we observe that with a given false alarm probability, our proposed algorithm reduces the missing probability by 27% than the traditional embedded spectrally agile radio protocol for evacuation (ESCAPE) algorithm in the best condition.

• The Korean Journal of Applied Statistics
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• v.19 no.3
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• pp.535-544
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• 2006

We consider use of Bootstrap calibration in the problem of setting a confidence interval for a linear combination of variance components. Based on the the modified large sample(MLS) method by Graybill and Wang(1980), Bootstrap Calibration is applied to improve the coverage probability of the MLS confidence bound when the experiment is balanced and coefficients of a linear combination are positive. Performance of the proposed confidence bound in small sample is investigated by simulation studies.

• The Korean Journal of Applied Statistics
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• v.28 no.3
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• pp.485-494
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• 2015

Canonical correspondence analysis is an ordination method used to visualize the relationships among sites, species and environmental variables. However, projection results are fluctuations if the samples slightly change and consistent interpretation on ecological similarity among species tends to be difficult. We use the bootstrap methods for canonical correspondence analysis to solve this problem. The bootstrap method results show that the variations of coordinate points are inversely proportional to the number of observations and coverage rates with bootstrap confidence interval approximates to nominal probabilities.

• Journal of the military operations research society of Korea
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• v.2 no.1
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• pp.163-176
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• 1976

The artillery fire is characterized by great damage that can be inflicted simultaneously to an area through concentrated firing. The field artillery guns used in R.O.K. Army are generally old. Thus high values of their velocity errors cause wide dispersion of shell landings. Therefore effects of the concentrated firing is lessened. In this paper a general model which considers all error factors involved in firing in general, is established first. Then from this a basic model which includes the errors involved in concentrated firing only, such as the ballistic error, velocity error, target density function, and damage function, is extracted. Among many weapon systems now in use a specific one called gun 'A' is selected and its concentration effects are measured through computer simulation. The results show that as the velocity error of a battery increases, its target coverage capability, i. e. concentration effect, decreases. Therefore the need arises for the field artillery commander to know beforehand characteristics, i.e. velocity errors, of the guns in his unit and also to carefully examine the problem of battery arrangement with the gun characteristics in mind in order to maximize the damage effects of his artillery unit.

• The Journal of the Korean bone and joint tumor society
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• v.1 no.2
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• pp.226-232
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• 1995

Survival rate of osteosarcoma has been improved recently due to the neoadjuvant and adjuvant chemotherapy. Limb-salvaging operation(LSO) has replaced the amputation technique without' lowering the survival rate. And there occurred a lot of patients who are suffering from the high cost of artificial implants and forced to choose amputation due to economic problem. In LSO, usually relatively high cost artifical implant is needed. When a patient and not afford such an expensive implant he had to choose an inexpensive way, amputation. Authors tried bone lengthening by adopting Ilizarov technique after wide resection of tumor in two patients. Bone transportation was successful in one patient and less successful in the other. One case in CDF(continuosly disease free since the surgical procedure) state at follow-up 3 year 4 months after knee joint fusion. And the other was given lobectomy for lung metastasis at postop. 1 year and 9 months, and given osteosynthesis for infected nonunion at the docking site. Bone transportation was thought to be a good method for the bony coverage of dead space caused by wide resection. Bone transportation technique was economical as well as biological We present two osteosarcoma patient who treated with Ilizarov bone transportation.

• Journal of electromagnetic engineering and science
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• v.18 no.3
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• pp.199-205
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• 2018

In this study, an imaging mode of the modified SweepSAR is proposed with performance analysis for a high-resolution and wide swath coverage. To reduce the overall antenna size required for the solution of the azimuth ambiguity problem, different pulse repetition frequencies (PRFs) are utilized for different transmitters, respectively. For each imaging mode, system performance parameters are used for simulation, analysis, wide swath prediction, and comparison between conventional ScanSAR mode and SweepSAR mode based on scanon-receive (SCORE). The system parameters of AASR, RASR, and NESZ will be estimated and suggested on the imaging mode by using appropriate reflector antenna with the effectiveness of a modified SweepSAR employing dual channels.